HBM4 mass production timeline pushed back to late Q1 2026 due to specification upgrades and NVIDIA's strategy adjustment

According to TrendForce's latest survey, NVIDIA adjusted the HBM4 specifications for its Rubin platform in Q3 2025, raising the Speed per Pin requirement to over 11Gbps. This necessitated design revisions by the three major HBM suppliers. Additionally, the AI boom has driven stronger-than-expected demand for NVIDIA's previous-generation Blackwell products, prompting a corresponding adjustment to the Rubin platform's mass production timeline. Both factors have delayed the ramp-up of HBM4 production, with mass production now expected to commence no earlier than the end of Q1 2026.

TrendForce reports that SK hynix, Samsung, and Micron have all resubmitted samples of their HBM4 products and are continuously refining designs to meet NVIDIA's stricter specifications. Compared to competitors, Samsung's HBM4 pioneers the 1Cnm process and utilizes its own foundry's advanced process for the base die. This enables support for relatively high-speed transmission specifications, positioning Samsung to become the first verified supplier. Consequently, it is expected to gain an advantage in supplying high-specification Rubin products. SK hynix, having already secured HBM contracts, is projected to maintain an absolute advantage in supply bit volume for 2026.

NVIDIA's product strategy shift is another key factor impacting HBM4 validation timelines. Driven by AI demand, NVIDIA has significantly raised its first-half 2026 shipment targets for B300/GB300 and increased HBM3e orders. Concurrently, it adjusted the Rubin platform mass production schedule, granting the three major HBM suppliers additional time to refine their HBM4 products. Based on current validation status, mass production of HBM4 is projected to commence no earlier than late Q1 to Q2 2026.